The theme of self - discovery for Ginny is often seen. As she delves deeper into the situation of Harry being a Horcrux, she might discover new aspects of herself, like her own strength in dealing with such a complex and dangerous situation. And there's also the theme of hope, that despite the seemingly impossible situation, there is always a way to save Harry and defeat Voldemort.
In this kind of fanfiction, it often shows Ginny's shock and the complex emotions she might have. She might be worried about Harry's fate, as being a Horcrux means he is tied to Voldemort in a very dangerous way. This discovery could lead to her trying to find a way to break the Horcrux connection without harming Harry.
One common theme is the growth of their relationship. As they hunt for Horcruxes together, their bond deepens whether it's a platonic friendship or something more in some interpretations.
Well, it depends on how the author writes it. Maybe Voldemort would initially be in disbelief. But once he accepts it, he could start to manipulate Harry in different ways. He might think that by controlling Harry, he can control the Horcrux within him. This could create some really interesting plot twists where Harry has to resist Voldemort's attempts at a much deeper level than just physical attacks.
Love is a very common theme. Most of these fanfictions focus on the deep and abiding love between Harry and Ginny. Another theme is adventure. Since they are from the wizarding world, they often go on adventures together, which are exciting to read about.
Well, identity exploration is a big one. Harry has to figure out what it means to be a Horcrux on top of being the Boy Who Lived. There is also the theme of moral conflict. He is part of Voldemort's dark creation, yet he is the symbol of hope. How does he balance this? Another common theme is the exploration of magic. Since he is a Horcrux, there could be new and different magical aspects to his being that fanfic writers can explore, like how his Horcrux - ness affects his magical abilities or his connection to other magical objects.
One possible consequence is that Harry becomes an even bigger target for Voldemort. Since a Horcrux is important to Voldemort's immortality, he'd be more determined to get to Harry. Also, Harry might start to experience some strange effects on his soul or magic due to being a Horcrux.
Overcoming limitations is also a theme. Since wandless magic is not the norm in the wizarding world as presented in the original books, Harry has to break through the traditional thinking. He has to deal with the doubts of others and his own insecurities. In some fanfics, he even has to face opposition from the Ministry of Magic who are wary of this unregulated form of magic.
Friendship is also a theme. His friends may play different roles in his learning process. Some might support him unconditionally, while others might not understand what he's going through, which can create interesting relationship dynamics within the fanfiction.
Family is also a big theme. They come from different family backgrounds, and in fanfiction, how they blend their families or start their own is often written about. For example, how Ginny's large family interacts with Harry, who has no real family of his own at first. And there's also the theme of friendship, as they have friends who play important roles in their lives even as they are in a relationship.
She might be devastated. Ginny loves Harry deeply, and the news of his impending death would shatter her world. It's likely she'd initially be in denial, not wanting to believe it could be true.